RFC-1 Accessories and Miscellaneous Circuits page 4.2
4.1.6 RS-232 Serial Data Adapter
The RS-232 Serial Data Adapter provides a means for the RFC-1 to communicate with external serial devices. This
adapter can be used with a serial printer on site, or with an external modem or network translation device to access a
remote computer or printer. Voice/DTMF capability is not lost when the RS-232 is installed. The RS-232 consists of
a small accessory board that attaches to the RFC-1 and new chassis parts to house the expanded system.
4.1.7 RAK-2 Intelligent Rack Adapter
The Intelligent Rack Adapter model RAK-2 gives the RFC-1 a network interface that provides a web interface,
email/SMS messaging and network time syncing capabilities. The system includes front panel indicators, telephone
line surge suppression and a universal 120/240 VAC supply. The RAK-2 is housed in a rack mountable chassis and
requires a single rack space.
4.1.8 ACM-2 AC Current Monitor
The ACM-2 AC Current Monitor is designed to monitor tower lighting but it may be used for any application requiring
AC current monitoring. The ACM-2 can monitor up to 70 amps of AC current and it provides a proportional DC
voltage output. Filter circuits in the ACM-2 average the alternating current so that a steady reading is available even
when flashing beacons are used. The DC output connects to a telemetry channel on the RP-8. In most cases, the
resolution of the ACM-2 is more than sufficient to detect the failure of one bulb in a lighting system.
4.1.9 AFS-3 Audio Failsafe
The AFS-3 Audio Failsafe is typically used to trigger an alarm on a remote control system or terminate transmission if
program audio fails. It monitors one or two audio signals and provides a relay contact closure as long as audio is
present on at least one of the audio inputs. When no audio is present on either input for a preset length of time, the
relay contacts open and an Alarm LED lights. The length of the delay is adjustable from 30 seconds to 5.0 minutes in
30-second increments.
4.1.10 Thermal Sentry III
The Thermal Sentry provides an indication of operating efficiency by measuring the air temperature difference across
the transmitter. This device uses sensors to monitor the temperature at both the air intake and exhaust points of the
main transmitter cabinet. The temperature differential is calculated and displayed on the front panel LED display.
After normal operating conditions are determined the tolerance can be set to provide an alarm when the temperature
goes out of range. Thermal efficiency can warn of problems like clogged air filters, failed cooling blowers and
antenna icing before damage occurs to the transmitter. Analog outputs for the intake, exhaust and differential
temperatures are provided for monitoring by the RFC-1. A logic output for the alarm is also provided.
4.1.11 DCA-2 DC Voltage Amplifier
The DCA-2 Telemetry Amplifier increases the voltage of a telemetry sample when the voltage is too low to generate
an accurate reading. The RFC-1/B will give a full scale reading with as little as one volt applied at the telemetry input.
The vast majority of broadcast equipment can generate an adequate sample voltage without assistance. The DCA-2
is designed to assist devices that do not meet the minimum voltage requirement.
4.1.12 TS-1/PS Temperature Sensor with Power Supply
The TS-1/PS Temperature Sensor is a temperature sensor that measures air temperature from 5.0° F to 203.9° F.
The DC output connects to a telemetry input the RP-8 and provides 0.1° resolution. Additional temperature sensors
can share a single power supply and are available as part number TS-1.
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